Single Heavy MSSM Higgs Production at e+e- Linear Collider

We briefly review the single heavy Higgs production at high energy e+e- linear collider, \gamma\gamma collider and e-\gamma collider. We present the recent results for e+e- --> W^{\pm}H^{\mp} in the Minimal Supersymmetric Standard Model and preliminary results for e+e- --> \nu \bar\nu A^0.